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Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the package registry, see the documentation. CC0: http://creativecommons.org/publicdomain/zero/1.0/ ==== Files located in the post that we want C3 and C4 could use fewer caps that way Latest commits for branch pcb_finalization re-re-remove the mysterious extra trace 5040873587dbb57684343269abab88d35cf7124b more fixes dcaec240831d28b722a7d7988287c76a1461e439 more fixes a5c5ff12ce18fecaaf346f973863d12bf361ac82 re-re-remove the mysterious extra trace Add notes about wiring SW15 cross-board 9360e76802 Add design rules for jlcpcb 4ee6887723 Add some perfboard sections.

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